SNLS313I September 2009 – October 2019 DS90UR905Q-Q1 , DS90UR906Q-Q1
PRODUCTION DATA.
The VDD (VDDn and VDDIO) supply ramp should be faster than 1.5 ms with a monotonic rise. If slower then 1.5 ms then a capacitor on the PDB pin is needed to ensure PDB arrives after all the VDD have settled to the recommended operating voltage. When PDB pin is pulled to VDDIO, it is recommended to use a 10-kΩ pullup and a > 10 µF capacitor to GND to delay the PDB input signal.